New trees/plants

Bought three new trees in this wonderful vivero in Emiliano Zapata up the coast from Melaque. Questions are ...

Coastal avocados - guy says they are dark like Hass but meat is different

Chico Zapote - got the idea the tree is small as well as the fruit ... but Internet says the trees can be huge

Carambolo (star fruit) - how big is the tree

Also got two "Sisus" which the Internet says should be Sissus. Pictures don't match for either. It's a type of Ivy that covers walls very well. I already have one here. Sparks Mexico - Sparks Costalegre